The Sultanate of BRUNEI is a small country located on the island of Borneo in Southeast Asia. It is a monarchy ruled by the Sultan of BRUNEI, who has held the title since 1967. BRUNEI is one of the world's wealthiest countries due to its large oil and gas reserves. The Sultanate of BRUNEI is a constitutional monarchy with a parliamentary system of government. The Sultan is the head of state and is responsible for appointing the Prime Minister and other members of the cabinet. BRUNEI is a member of the Commonwealth of Nations and the Organisation of Islamic Cooperation.